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10-02-2012, 06:27 PM #11
I have checked into this voltage issue. the PCM turns OFF the alternator when in the fuel saving mode. this is not at all good for the battery . the constant charge / discharge will shorten the batteries life . GM however can claim that these vehicles get XXX MPG.
Another reason for ME to not buy these vehicles.
10-02-2012, 07:02 PM #12
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- Mar 2007
- Grand Prairie, Texas
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Over charging the battery is even worse for it, and whether you know it or not your present truck allows the battery to charge and discharge in the same manner only it uses the voltage regulator to do this instead of freewheeling the alternator. Doing the same thing only in a different manner and making the engine more efficient.
10-02-2012, 07:15 PM #13
Nothing is free. The fuel you save while not charging will HAVE to be spent on the extra power used to recharge. They get to claim fuel savings in that mode and I am sure they do but you can't stay there forever and when you come out of it, extra fuel wil be used to drive an alternator under a heavier load while recharging.
Seems a poor choice to stress alternator and battery for PR and have the customer still pay for the gas and replace components prematurely. I would love to see the test data that proves me wrong.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
10-03-2012, 07:49 AM #14
I agree with this 100% ! your stressing out both the battery and alternator.
The regulator over many decades now has been controlling the battery charging quite well.
I get 7 years on my batteries. then replace. working or not.
10-04-2012, 07:49 PM #15
I'm sure the alternator is working correctly. The defective battery was charged for 90 minutes and then load tested. The electrical system had to also be tested to be sure that the battery was getting a charge. GM builds 9 million vehicles a year, that is a lot of batteries and to get a bad one out of the box is quite probable. The heat in South Florida really beats up the lead acid batteries. If you get five years from any battery you're lucky. I've lived in South Florida for 22 years and of all the cars and trucks I've own an average of three-four years is normal. I've not have paid a full price on a battery for years. I buy the six year warranty units and they always get prorated.
10-05-2012, 05:10 AM #16
What you're seeing is "normal". I watched mine and it seemed to only charge at 12 volts. Took it back to the dealer he told me it was OK. Two days later the battery went dead. They fixed something it now has 100,000 miles on it and reads higher than 13v most of the time.
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